<h2>DESCRIPTION</h2>

<em>i.evapo.mh</em> calculates the reference evapotranspiration (ET) after
Hargreaves et al. (1985), Hargreaves and Samani (1985) and the Modified Hargreaves version found in Droogers and Allen (2002). 

<h2>SEE ALSO</h2>

<em>
<a href="i.evapo.pt.html">i.evapo.pt</a>,
<a href="i.evapo.pm.html">i.evapo.pm</a>,
<a href="i.evapo.time.html">i.evapo.time</a>,
<a href="r.sun.html">r.sun</a>
</em>

<h2>REFERENCES</h2>

<ul>
<li> Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural benefits for
Senegal River Basin. Journal of Irrigation and Drainange Engineering,
ASCE, 111(2):113-124.</li>
<li> Droogers P, Allen RG, 2002. Towards a simplified global reference
evapotranspiration equation. Irrigation Science.</li>
<li> Droogers, P., Allen RG. 2002. Estimating reference evapotranspiration
under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.</li>
<li> Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspiration from
 ambient air temperature. American Society of Agricultural Engineers
 (Microfiche collection)(USA). no. fiche no. 85-2517.</li>
</ul>

<h2>AUTHORS</h2>

Yann Chemin, GRASS Development team, 2007-2016<br>

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